Silica sacrificing effect against water vapor in multilayer environmental barrier coatings

Hongkang Ou; Kaifei Fan; Lingxiang Guo; Yuyu Zhang; Bing Liu; Ting Xu; Jia Sun; Qiangang Fu

doi:10.1016/j.surfcoat.2025.132027

Silica sacrificing effect against water vapor in multilayer environmental barrier coatings

Hongkang Ou, Kaifei Fan, Lingxiang Guo, Yuyu Zhang, Bing Liu, Ting Xu, Jia Sun, Qiangang Fu

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

Abstract

An environmental barrier coating (EBC) with the alternative multilayer structure was fabricated by plasma-sprayed ZrO₂-modified Yb₂SiO₅ and MoSi₂ as sublayers. The water-vapor corrosion test at 1500 °C is up to 100 h revealing a structure transformation from ZrO₂-Yb₂SiO₅ coating in which MoSi₂ was the sublayer to ZrO₂-Yb₂Si₂O₇ coating in which SiO₂ was the sublayer. By sacrificing the SiO₂ phase, a structural evolution emerged from dissolved SiO₂ to lamellar pores with volatilization of SiO₂. Layer-by-layer spallation avoided the complete delamination of the composite coating, and the sacrificing of SiO₂ can inhibit the inward invasion of oxygen and water vapor. The enhanced water vapor corrosion resistance and oxygen barrier effect of the multilayer coating contributed to the thin TGO-thickness of alternative multilayer EBC, as well as the long service life.

Original language	English
Article number	132027
Journal	Surface and Coatings Technology
Volume	504
DOIs	https://doi.org/10.1016/j.surfcoat.2025.132027
State	Published - 15 May 2025

Keywords

Environmental barrier coatings
Niobium alloy
Water vapor corrosion
Ytterbium silicate

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10.1016/j.surfcoat.2025.132027

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title = "Silica sacrificing effect against water vapor in multilayer environmental barrier coatings",

abstract = "An environmental barrier coating (EBC) with the alternative multilayer structure was fabricated by plasma-sprayed ZrO2-modified Yb2SiO5 and MoSi2 as sublayers. The water-vapor corrosion test at 1500 °C is up to 100 h revealing a structure transformation from ZrO2-Yb2SiO5 coating in which MoSi2 was the sublayer to ZrO2-Yb2Si2O7 coating in which SiO2 was the sublayer. By sacrificing the SiO2 phase, a structural evolution emerged from dissolved SiO2 to lamellar pores with volatilization of SiO2. Layer-by-layer spallation avoided the complete delamination of the composite coating, and the sacrificing of SiO2 can inhibit the inward invasion of oxygen and water vapor. The enhanced water vapor corrosion resistance and oxygen barrier effect of the multilayer coating contributed to the thin TGO-thickness of alternative multilayer EBC, as well as the long service life.",

keywords = "Environmental barrier coatings, Niobium alloy, Water vapor corrosion, Ytterbium silicate",

author = "Hongkang Ou and Kaifei Fan and Lingxiang Guo and Yuyu Zhang and Bing Liu and Ting Xu and Jia Sun and Qiangang Fu",

note = "Publisher Copyright: {\textcopyright} 2025",

year = "2025",

month = may,

day = "15",

doi = "10.1016/j.surfcoat.2025.132027",

language = "英语",

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T1 - Silica sacrificing effect against water vapor in multilayer environmental barrier coatings

AU - Ou, Hongkang

AU - Fan, Kaifei

AU - Guo, Lingxiang

AU - Zhang, Yuyu

AU - Liu, Bing

AU - Xu, Ting

AU - Sun, Jia

AU - Fu, Qiangang

PY - 2025/5/15

Y1 - 2025/5/15

N2 - An environmental barrier coating (EBC) with the alternative multilayer structure was fabricated by plasma-sprayed ZrO2-modified Yb2SiO5 and MoSi2 as sublayers. The water-vapor corrosion test at 1500 °C is up to 100 h revealing a structure transformation from ZrO2-Yb2SiO5 coating in which MoSi2 was the sublayer to ZrO2-Yb2Si2O7 coating in which SiO2 was the sublayer. By sacrificing the SiO2 phase, a structural evolution emerged from dissolved SiO2 to lamellar pores with volatilization of SiO2. Layer-by-layer spallation avoided the complete delamination of the composite coating, and the sacrificing of SiO2 can inhibit the inward invasion of oxygen and water vapor. The enhanced water vapor corrosion resistance and oxygen barrier effect of the multilayer coating contributed to the thin TGO-thickness of alternative multilayer EBC, as well as the long service life.

AB - An environmental barrier coating (EBC) with the alternative multilayer structure was fabricated by plasma-sprayed ZrO2-modified Yb2SiO5 and MoSi2 as sublayers. The water-vapor corrosion test at 1500 °C is up to 100 h revealing a structure transformation from ZrO2-Yb2SiO5 coating in which MoSi2 was the sublayer to ZrO2-Yb2Si2O7 coating in which SiO2 was the sublayer. By sacrificing the SiO2 phase, a structural evolution emerged from dissolved SiO2 to lamellar pores with volatilization of SiO2. Layer-by-layer spallation avoided the complete delamination of the composite coating, and the sacrificing of SiO2 can inhibit the inward invasion of oxygen and water vapor. The enhanced water vapor corrosion resistance and oxygen barrier effect of the multilayer coating contributed to the thin TGO-thickness of alternative multilayer EBC, as well as the long service life.

KW - Environmental barrier coatings

KW - Niobium alloy

KW - Water vapor corrosion

KW - Ytterbium silicate

UR - http://www.scopus.com/inward/record.url?scp=86000589048&partnerID=8YFLogxK

U2 - 10.1016/j.surfcoat.2025.132027

DO - 10.1016/j.surfcoat.2025.132027

M3 - 文章

AN - SCOPUS:86000589048

SN - 0257-8972

VL - 504

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

M1 - 132027

ER -

Silica sacrificing effect against water vapor in multilayer environmental barrier coatings

Abstract

Keywords

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